By Walt Hickey Have a great weekend! Sunday was another Numlock Podcast edition of the Sunday edition, available for anyone to listen to on Apple Podcasts, Spotify or wherever you get your podcasts, it’s a really great episode. Covers Cover songs used to be a pretty reliable fraction of the Billboard Hot 100, typically accounting for 20 percent to 30 percent of the songs in the ranking in the 1960s and 1970s. That fraction declined through the late 1990s, but covers of songs by other artists have been pretty much absent from the Hot 100 since the 2000s. The last cover to hit No. 1 was “